update prod run script

bin/prod

@@ -10,15 +10,15 @@ export FLASK_ENV=production
 
 mkdir -p $BASE
 
-kill $(cat $BASE/gunicorn.pid) 2>&1
+pgrep -F $BASE/gunicorn.pid
 
-gunicorn \
-  --bind 127.0.0.1:4000 "suchwow.app:app" \
-  --daemon \
-  --log-file $BASE/gunicorn.log \
-  --pid $BASE/gunicorn.pid \
-  --reload
-
-sleep 1
-
-echo "Starting gunicorn with pid $(cat $BASE/gunicorn.pid)"
+if [[ $? != 0 ]]; then
+  gunicorn \
+    --bind 127.0.0.1:4000 "suchwow.app:app" \
+    --daemon \
+    --log-file $BASE/gunicorn.log \
+    --pid $BASE/gunicorn.pid \
+    --reload
+  sleep 1
+  echo "Starting gunicorn with pid $(cat $BASE/gunicorn.pid)"
+fi